Constructal design of gas-cooled electric power generators, self-pumping and atmospheric circulation
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© 2015 Elsevier Ltd. All rights reserved. Rotating electric machines generate heat volumetrically, and are cooled by forced convection aided by the self-pumping effect. In this paper we focus on the fundamental relationship between the internal flow architecture of the gas cooled winding and its thermal performance, which is represented by the nearly uniform distribution of peak temperature throughout the winding volume. We show that the cooling passages can be sized such that the volumetric cooling is most effective. From this finding follows the number of passages and their distribution through the heat generating volume. The principle is developed analytically, and it is then validated based on numerical simulations of the cooling architecture. The paper also reports the thermodynamics basis of the self-pumping effect, and its natural occurrence as free convection in general, which includes atmospheric circulation.
Published Version (Please cite this version)10.1016/j.ijheatmasstransfer.2015.07.015
Publication InfoBejan, Adrian; Kim, Y; Lee, J; & Lorente, S (2015). Constructal design of gas-cooled electric power generators, self-pumping and atmospheric circulation. International Journal of Heat and Mass Transfer, 91. pp. 647-655. 10.1016/j.ijheatmasstransfer.2015.07.015. Retrieved from http://hdl.handle.net/10161/15203.
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J.A. Jones Professor of Mechanical Engineering
Professor Bejan's research covers engineering science and applied physics: thermodynamics, heat transfer, convection, design, and evolution in nature. Professor Bejan was ranked in 2001 among the 100 most highly cited authors worldwide in engineering (all fields, all countries), the Institute for Scientific Information. Professor Bejan has received 18 honorary doctorates from universities in 11 countries. Adrian Bejan is the author of 30 books and over 650 peer-referred
Adjunct Professor in the Department of Mechanical Engineering and Materials Science
Lorente's research interests encompass vascularized materials, constructal theory, porous media, fluid mechanics, heat and mass transfer.
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